Claims
- 1. A method of operating an orbital saw for transversely severing elongated, superposed, multi-ply web material comprising:
- providing a frame defining a linear path for elongated web plies,
- continuously advancing said elongated web plies along said linear path,
- rotatably mounting a relatively elongated arm on said frame,
- rotating said arm about an axis skewed with respect to said linear path,
- rotatably mounting a blade on said arm for rotation therewith, rotation of said arm orbiting said blade with the orbit of said blade intersecting said linear path, and
- mounting a grinding stone for said blade on said arm so that the grinding stone is always positioned radially inwardly of said blade orbit whereby centrifugal forces are reduced and cyclic loading is substantially eliminated.
- 2. The method of claim 1 including the step of contacting the grinding stone intermittently with said blade.
- 3. The method of claim 1 in which the blade has a pair of cutting surfaces and including the step of grinding both of said cutting surfaces by mounting said grinding stone adjacent one of said cutting surfaces and mounting a second grinding stone adjacent the other cutting surface.
- 4. The method of claim 1 including the step of severing said web material at least twice during each rotation of said arm by mounting at least two blades on said arm.
- 5. The method of claim 1 including the step of severing said web material at least twice during each rotation of said arm by mounting an elongated bar having a pair of ends on said arm and mounting said blade on one end of the elongated bar and mounting a second blade on the other end of the elongated bar.
- 6. The method of claim 1 in which said skew is compensated by coupling a 4-bar linkage to said elongated arm.
- 7. The method of claim 6 in which said 4-bar linkage includes first, second, third, and fourth bars, and mounting said blade and said grinding stone on one of said third or fourth bars.
- 8. The method of claim 7 in which said blade and said grinding stone are mounted on said third bar and mounting a second blade and a second grinding stone on said fourth bar.
- 9. The method of claim 7 in which the blade has a pair of cutting surfaces and including the step of grinding both of said cutting surfaces by mounting said grinding stone adjacent one of said cutting surfaces and mounting a second grinding stone adjacent the other cutting surface.
- 10. The method of claim 1 in which said advancing step includes advancing logs of convolutely wound material.
- 11. The method of claim 1 in which said advancing step includes advancing interfolded plies.
- 12. The method of claim 1 in which the advancing step includes advancing web plies with a cross sectional area of at least about 3.5 in.sup.2 (2200 mm.sup.2), the blade having a center, and orbiting said blade so that the center of the blade follows an orbit having a diameter of at least about 30 inches (750 mm).
- 13. The method of claim 12 in which the blade has a pair of cutting surfaces and including the step of grinding both of said cutting surfaces by mounting said grinding stone adjacent one of said cutting surfaces and mounting a second grinding stone adjacent the other cutting surface.
- 14. A method of operating an orbital saw for transversely severing elongated, superposed, multi-ply web material comprising:
- providing a frame defining a linear path for elongated web plies,
- continuously advancing said elongated web plies along said linear path,
- rotatably mounting a relatively elongated arm on said frame,
- rotating said arm about an axis skewed with respect to said linear path,
- coupling a four-bar linkage to said arm, said four-bar linkage having means for compensating for said skew,
- rotatably mounting a blade on said four-bar-linkage,
- providing rotating means on said linkage for rotating said blade, rotation of said arm orbiting said blade with the orbit of said blade intersecting said linear path, and
- mounting a grinding stone for said blade on said four-bar linkage so that the grinding stone is always positioned radially inwardly throughout the entirety of said blade orbit whereby centrifugal forces are reduced and cyclic loading is substantially eliminated.
- 15. The method of claim 14 in which said four-bar linkage includes first, second, third and fourth bars, coupling said first bar to said elongated arm, one of said third and fourth bar carrying said blade, and said second bar having a pair of end portions which extend angularly relative to the first bar to accommodate said grinding stone.
- 16. A method of operating an orbital saw comprising the steps of:
- providing a frame defining a linear path for elongated web plies,
- continuously advancing said elongated web plies along said linear path,
- rotatably mounting a relatively elongated arm on said frame,
- rotating said arm about an axis skewed with respect to said linear path,
- rotatably mounting a plurality of blades on said arm,
- compensating for the skew of said arm so that the blades rotate perpendicularly to said linear path, rotation of said arm orbiting said blades with the orbit of said blades intersecting said linear path, and
- mounting a grinding stone for each said blade on said arm so that each grinding stone is positioned radially inwardly of said blade orbit whereby centrifugal forces are reduced and cyclic loading is substantially eliminated.
- 17. The method of claim 16 in which said step of rotatably mounting blades comprises mounting a pair of blades.
- 18. The method of claim 16 in which said step of rotatably mounting blades comprises mounting three blades.
- 19. The method of claim 16 in which each of the blades has a pair of cutting surfaces and including the step of grinding both of said cutting surfaces by mounting said grinding stone adjacent one of said cutting surfaces and mounting a second grinding stone adjacent the other cutting surface .
- 20. A method of operating an orbital saw to transversely sever superposed elongated web plies into shorter length products comprising the steps of
- advancing, along a linear path, said superposed elongated web plies having a cross-sectional area of at least about 3.5 in.sup.2 (2200 mm.sup.2),
- providing a 4-bar linkage including first and second bars extending generally parallel to each other and third and fourth bars, each of said bars having a pair of ends,
- connecting said first and second bars adjacent the ends thereof with said third and fourth bars to provide at least one degree of pivotal freedom of said third and fourth bars relative to said first and second bars,
- rotatably mounting a disc blade on each of said third and fourth bars, each of the disc blades having a center,
- rotating said first bar about a first axis to orbit said blades with the orbit of said blades intersecting said linear path and with centers of said disc blades being at least 30 inches (750 mm) apart while skewing said first axis at a minor acute angle to said linear path,
- rotating said second bar about a second axis different from said first axis to compensate for said skewing and to orient said disc blades perpendicular to said web plies in said linear path when severing said web plies,
- mounting a grinding stone and on each of said third and fourth bars so that each grinding stone is positioned radially inwardly of the orbit of said blades throughout the entirety of said blade orbit whereby centrifugal forces are reduced and cyclic loading is substantially eliminated.
- 21. The method of claim 20 in which each of the blades has a pair of cutting surfaces and including the step of grinding both of said cutting surfaces by mounting said grinding stone adjacent one of said cutting surfaces and mounting a second grinding stone adjacent the other cutting surface.
Parent Case Info
This application is a continuation-in-part of application Ser. No. 08/223,543, filed Apr. 6, 1994, now US. Pat. No. 5,557,997.
US Referenced Citations (27)
Foreign Referenced Citations (5)
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930737 |
Jul 1955 |
DEX |
248415 |
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Continuation in Parts (1)
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Number |
Date |
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Parent |
223543 |
Apr 1994 |
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